Improvement in electro-magnetic bell-striking apparatus



Patented Oct. 24,1876.

INVENTOR WITNESSES N-PETEJZS. PHOTO LITHOGRAPHER. WASHINGYON. D C.

UNITED STATES PATENT QFFIGE.

FRANK W. GRISWOLD, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO HIMSELF ANDDEXTER L. PIERCE, OF SAME PLACE.

IMPROVEMENT IN ELECTRO-MAGNETIC BELL-STRIKING APPARATUS.

Specification forming part of Letters Patent No. 183,665, dated October24, 1876; application filed June 6, 1876.

To all whom it may concern Be it known that I, FRANK W. GRIswoLD, ofProvidence, county of Providence, and State of Rhode Island, haveinvented a new and useful Improvement in Mechanism for StrikingFire-Alarm Signals; and I do declare the following to be a full, clear,and exact description thereof, reference being had to the'accompanyingdrawing, forming a part of these specifications.

My invention consists of an improved mechanism for striking fire-alarmsignals, hereinafter fully described, and pointed out in the claims.

In the accompanying drawing, Figure 1 rep-- resents a general view ofmechanism for striking fire-alarm signals, constructed according to myimprovement, showing the same at rest when in a closed clrcuit ot'telegraph-line. Fig. 2 is a view of the same with the circuit broken,and after the blow has been delivered. Fig. 3 is a view of the same withcircuit broken, when about to deliver a blow. Figs. 4, 5, and 6 aredetailed parts.

Similar letters of reference indicate corresponding parts.

I make use of an ordinary clock-work train (which I do not deemnecessary to show) to run the mechanism, the front plate of which islettered A. B is acrank, actuated by train through arbor a, and at aproper distance from center is placed the wrist b and pin or roller 0.To the wrist is attached the connecting-rod E, which communicatesmotion, through levers F and G, to lever H and hammer l. G is theescapement-lever, with a circular arm, M, stop r, and locking-pin e, andmoves upon the pivot 11. The object of said lever is to prevent thestriking of more than one blow when the circuit is broken. D is a lever,with armature K attached, pivoted at 7', and having upon its long armlocking-pin f and click g.

lever and click. 1) and o are pins to regulate the motion of the leverD. k and n are fixed l and m are joints pivots for levers f and h.

t and h are tension-springs to between E, F, G, and H. J is the bell,and L a magnet.

Upon breaking the circuit, the spring t draws the lever D up, thusfreeing the pin 6 from the locking-pin f. The pressure of train on crankforces the lower end of escape ment-lever away from pin f, and releasesthe crank from the stop r, allowing it to revolve in the direction ofthe arrow. A one-hall revolution of the crank raises the conheating-rod. E and levers F and G, thus bringing the short arm of thelever H toward the fixed pivot k, and raising the hammer I from thebell, and at the same time the roller 0 comes in contact with thecircular arm M of the escapementlever, as shown in Figs. 3 and 6. Thecrank still revolving in the direction indicated, the roller 0 forcesthe circular arm of the escapement-lever back, bringing the locking-pinc in contact with the click g. The click depresses and allows the pin 6to pass. At this time the roller 0 comes in contact with the stop 1",reversing the motion of the escapement-lever, and stopping it on theclick 9, as shown in Fig. 5. This second halfrevolution of the crankreverses the action of the levers F and G, delivering a blow, and leavesthem as shown in Figs. 2 and 5. Upon closing the circuit the pin e isdrawn off the click 9 and looks with pin f, as shown in Figs. 1 and 4.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. The circular-armed escapement-lever G, with its locking-pin e andstop 1'.

2. In combination with the crank B, escapement-lever O, andarmature-lever D, the roller or pin 0 and click 9.

3. The levers F and G, in combination with the lever H, connecting'rodE, and crank B, the whole constructed and arranged substantially as andfor the purposes specified.

FRANK W. GRISWOLD. -Witnesses:

J. S. G. COBB, WM. R. DUTEMPLE.

